compare.java

通过键盘动态输入三个数字

//Powered by Li Gang, 421341  
//3.9  Make a program：input 3 numbers，and order them

import java.io.*;

//To order 3 numbers
class oder {
      public static void comp(double a, double b, double c){
             double t1=0; double t2=0; double t3=0;
             if(a>=b){
    	             if(b>=c) {t1=a; t2=b; t3=c;}
    	             else 
    	                    if(a>=c){t1=a; t2=c; t3=b;}
    	                    else {t1=c; t2=a; t3=b;} 
  	      }
  	     if(a<=b) {
  	             if(b<=c) {t1=c; t2=b; t3=a;}	
  	             else
  	                    if(a<=c) {t1=b; t2=c; t3=a;}
  	                    else {t1=b; t2=a; t3=c;}
  	      }
             System.out.print("The order is：");
             System.out.println(" "+t1+" > "+t2+" > "+t3);             
       }	  
 }

//To get value of the key from the keyboard
class Get { 
      public static double readDouble() {return Double.parseDouble(readStr());} 
      public static String readStr() { 
             BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); 
             String str=" "; 
             try { str=br.readLine(); } 
             catch (IOException ex) {  System.out.println(ex); } 
             return str; 
       } 
 }

//the primary class
class compare {
      public static void main(String args[]){     
             System.out.println("\n================Order Numbers=================");
             System.out.println("            Please input 3 numbers            "); 
             System.out.print("  No.1： "); double n1; n1=Get.readDouble();   
             System.out.print("  No.2： "); double n2; n2=Get.readDouble();
             System.out.print("  No.3： "); double n3; n3=Get.readDouble();
             System.out.println("==============================================");
             oder.comp(n1, n2, n3);
       }   
 }